Excel Timeline Slicer not working in formula for days

Afternoon.

I have a CUBEVALUE formula that I use to pull figures from a PowerPivot model, and I use a Timeline Slicer (not regular Slicer) to slice the dates.

It works fine when slicing using YEAR/QUARTERS/MONTHS and even multiple selections in the DAYS section, but as soon as I select a single day, it doesn't work, I get an N/A error. There is values for the selected day, I've checked multiple days and it doesn't work on a single day selection.

Anyone know what the issue is?

Thanks

Sorry I didn't reply when I first asked this question as I found a workaround by adding a Calculated Column in my Date Table with the formula =TRUE() and brought that into my CUBEVALUE formula as CUBEMEMBER.

This issue only happens with a TimeLine slicer with the CUBEVALUE formual.

Everyone I speak to about this is weirded out by it and some, including myself wants to know what the issue is?

Anyway, I've attached a sample workbook with data just for Jan 2019.

You'll see when you click on the TimeLine just for single days it returns an error, if you select multiple days or months/years, it works fine.

Thanks